US5726711A - Intra-coded video frame data processing methods and apparatus - Google Patents

Intra-coded video frame data processing methods and apparatus Download PDF

Info

Publication number
US5726711A
US5726711A US08/616,303 US61630396A US5726711A US 5726711 A US5726711 A US 5726711A US 61630396 A US61630396 A US 61630396A US 5726711 A US5726711 A US 5726711A
Authority
US
United States
Prior art keywords
intra
macroblocks
coded
frame
macroblock
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/616,303
Inventor
Jill MacDonald Boyce
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi America Ltd
Original Assignee
Hitachi America Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US415893A priority Critical
Priority to US08/228,949 priority patent/US5805762A/en
Priority to US08/298,015 priority patent/US5778143A/en
Application filed by Hitachi America Ltd filed Critical Hitachi America Ltd
Priority to US08/616,303 priority patent/US5726711A/en
Application granted granted Critical
Publication of US5726711A publication Critical patent/US5726711A/en
Anticipated expiration legal-status Critical
Application status is Expired - Fee Related legal-status Critical

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/76Television signal recording
    • H04N5/78Television signal recording using magnetic recording
    • H04N5/782Television signal recording using magnetic recording on tape
    • H04N5/783Adaptations for reproducing at a rate different from the recording rate
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/132Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/184Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being bits, e.g. of the compressed video stream
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/189Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the adaptation method, adaptation tool or adaptation type used for the adaptive coding
    • H04N19/192Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the adaptation method, adaptation tool or adaptation type used for the adaptive coding the adaptation method, adaptation tool or adaptation type being iterative or recursive
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/30Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability
    • H04N19/37Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability with arrangements for assigning different transmission priorities to video input data or to video coded data
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/40Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using video transcoding, i.e. partial or full decoding of a coded input stream followed by re-encoding of the decoded output stream
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/42Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
    • H04N19/423Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation characterised by memory arrangements
    • H04N19/426Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation characterised by memory arrangements using memory downsizing methods
    • H04N19/427Display on the fly, e.g. simultaneous writing to and reading from decoding memory
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/42Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
    • H04N19/423Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation characterised by memory arrangements
    • H04N19/426Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation characterised by memory arrangements using memory downsizing methods
    • H04N19/428Recompression, e.g. by spatial or temporal decimation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/587Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal sub-sampling or interpolation, e.g. decimation or subsequent interpolation of pictures in a video sequence
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/59Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial sub-sampling or interpolation, e.g. alteration of picture size or resolution
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/61Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/70Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by syntax aspects related to video coding, e.g. related to compression standards
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/80Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/80Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation
    • H04N19/82Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation involving filtering within a prediction loop
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/90Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41Structure of client; Structure of client peripherals
    • H04N21/414Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
    • H04N21/4147PVR [Personal Video Recorder]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network, synchronizing decoder's clock; Client middleware
    • H04N21/432Content retrieval operation from a local storage medium, e.g. hard-disk
    • H04N21/4325Content retrieval operation from a local storage medium, e.g. hard-disk by playing back content from the storage medium
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network, synchronizing decoder's clock; Client middleware
    • H04N21/433Content storage operation, e.g. storage operation in response to a pause request, caching operations
    • H04N21/4334Recording operations
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/13Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/30Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/90Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals
    • H04N19/91Entropy coding, e.g. variable length coding [VLC] or arithmetic coding
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/76Television signal recording
    • H04N5/78Television signal recording using magnetic recording
    • H04N5/782Television signal recording using magnetic recording on tape
    • H04N5/7824Television signal recording using magnetic recording on tape with rotating magnetic heads
    • H04N5/7826Television signal recording using magnetic recording on tape with rotating magnetic heads involving helical scanning of the magnetic tape
    • H04N5/78263Television signal recording using magnetic recording on tape with rotating magnetic heads involving helical scanning of the magnetic tape for recording on tracks inclined relative to the direction of movement of the tape
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/79Processing of colour television signals in connection with recording
    • H04N9/80Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/804Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
    • H04N9/8042Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/79Processing of colour television signals in connection with recording
    • H04N9/80Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/82Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
    • H04N9/8205Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal
    • H04N9/8227Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal the additional signal being at least another television signal

Abstract

Method and apparatus for generating a fully intra-coded video frame from a received progressive refresh bitstream representing a series of inter-coded video frames. Intra-coded macroblocks of received video frames are identified, selected, processed and stored to facilitate later combination into a single fully intra-coded composite video frame suitable for use during VTR trick play operation. As part of the intra-coded macroblock selection process, in various embodiments, the large sets of adjacent macroblocks are given priority over previously selected macroblocks that correspond to non-adjacent positions within a video frame or which correspond to a smaller set of adjacent video frames. As part of the macroblock processing performed prior to storage of selected intra-coded macroblocks, the amount of data used to represent each intra-coded macroblock is reduced and the macroblocks are processed so as to be represented in a consistent manner which facilitates the subsequent combination of intra-coded macroblocks from different frames into a single low resolution frame suitable for use during trick play operation.

Description

RELATED APPLICATION

This application is a divisional of co-pending patent application Ser. No. 08/298,015 filed on Aug. 30, 1994, which is a continuation-in-part of pending U.S. patent application Ser. No. 08/228,949, filed Apr. 18, 1994 which is a continuation of U.S. patent application Ser. No. 08/004,158, filed Jan. 13, 1993, now abandoned. Each of the above referenced patent applications is hereby expressly incorporated by reference.

FIELD OF THE INVENTION

The present invention is directed to data extraction techniques and, more particularly, to a method and apparatus for extracting data from a video bitstream and arranging the data into frames suitable for use during video tape recorder ("VTR") trick play operation.

BACKGROUND OF THE INVENTION

Generally, VTRs are designed to receive and store data signals representing video (and audio information) by recording the data on a magnetic tape in a series of tracks. In addition, most VTRs are designed to support both normal and trick playback operation, i.e., fast forward and reverse operation.

The use of digital video signals, e.g., digital high definition television ("HDTV") signals, which are normally transmitted in a compressed format, present problems with regard to the implementation of trick playback operation in VTRs.

Various systems have been proposed that would locate data selected to be used during trick play operation in specific locations within the tracks on a tape so that at least a minimum amount of data required to produce recognizable images during trick playback operation can be read in a reliable manner from the tape. However, because of limitations on the amount of data that can be read back from the tape during trick play operation using such systems, video images used during trick play operation must usually be represented using considerably less data than is used to represent images, e.g., frames, that are displayed during VTR normal playback operation.

Accordingly, because of the data constraints imposed during trick playback operation, it is important that the data used to represent video frames during trick playback operation be carefully selected.

Thus, the proposed digital VTR systems offer a number of possible solutions to the problem of how to record digital data on a tape so that it can be read from the tape in a reliable manner during trick play. However, there is still a need for an improved method and apparatus for selecting data from a compressed video data stream to represent a video frame that can be recorded on the video tape and read back and displayed during trick playback operation.

Because the method of selecting data from a video data stream for use during trick playback operation will depend in large part on the content of the compressed video data stream from which the data must be selected, it is important to have an understanding of the various elements of a compressed digital video data stream, how those elements, e.g., video frames, slices, macroblocks, motion vectors, DCT coefficients, etc., relate to each other, and how the compressed video data stream is originally created.

The International Standards Organization has set a standard for video data compression that is suitable for generating a compressed digital data stream such as a digital HDTV data stream. This standard is referred to as the ISO MPEG-2 (International Standards Organization--Moving Picture Experts Group) ("MPEG-2") standard.

While various versions of this data compression standard exist, and new versions are expected in the near future, all versions of the MPEG-2 standard are expected to use the same basic data compression techniques. For the purposes of this application, unless indicated otherwise, terms will be used in a manner that is consistent with the MPEG-2 standard that is described in the International Standards Organization--Moving Picture Experts Group, Draft of Recommendation H.262, ISO/IEC 13818-2 titled "Information Technology--Generic Coding Of Moving Pictures and Associated Audio" (hereinafter "the November 1993 ISO--MPEG Committee draft") hereby expressly incorporated by reference. Any references made in this patent application to MPEG-2 data streams is to be understood to refer to data streams that comply with MPEG-2 standards as defined in the November 1993 ISO--MPEG Committee draft.

In accordance with the MPEG standard, analog video signals are digitized and compressed in accordance with an MPEG data compression algorithm to produce the digital video data stream.

In accordance with the MPEG data compression algorithm, after the analog video signals are digitized, the digital data is organized into macroblocks and the macroblocks are then encoded.

In accordance with the MPEG standard, within a given frame, each macroblock may be coded using one of several different encoding techniques, e.g., motion compensation techniques. Intra-frame coding refers to a macroblock coding technique in which only spatial information is used. Intra-coded macroblocks are produced using this coding technique.

Inter-frame coding, unlike intra-frame coding, uses motion compensation techniques which utilize data from other frames when performing the encoding operation. Accordingly, inter-coded macroblocks which are produced using inter-frame coding techniques are dependent on preceding and/or subsequent frames and include motion vectors which are the result of the motion compensation operation. The MPEG-2 standard allows for the optional use of both intra-coded and inter-coded macroblocks in a video frame.

In accordance with the MPEG compression algorithm, after motion vectors have been calculated in video frames that are to be inter-coded, each of the intra-coded and inter-coded macroblocks which comprise the video data are transform encoded by performing a discrete cosine transform ("DCT") operation. As a result of the DCT operation, blocks of DCT coefficients are produced. These coefficients include both DC and higher frequency (AC) coefficients.

After performing the DCT operation, the resulting data is variable length encoded by performing adaptive quantization on the data with the quantization factor mquant used being indicated by header information included in the encoded video data stream that is produced as a result of the encoding operation.

The MPEG standard provides for the arrangement of macroblocks into slices with each frame being made up of one or more slices. A slice is an integer number of consecutive macroblocks from a raster of macroblocks. Video frames which include only intra-coded macroblocks are referred to as intra-coded ("I-") frames. Video frames which include predictively coded macroblocks are refered to as P-frames. While frames which include bi-directionally coded macroblocks are referred to as B-frames. P- and B-frames are, because of the type of encoding used, inter-coded frames.

In accordance with MPEG proposal, frames may be arranged into ordered groups refered to as groups-of-pictures. Normally, when I-frames are used, it is expected that each group-of-pictures will contain at least one I-frame. The use of groups-of-pictures, which is optional in MPEG-2, is intended to assist random access into the sequence.

To summarize, an MPEG data stream generated using the encoding technique described above, includes a series of variable length encoded video frames, each frame being represented by a series of intra-coded and/or inter-coded macroblocks, where each macroblock includes DCT coefficients and possibly motion vectors. Furthermore, the data representing the video frames may be arranged as groups-of-pictures while the macroblocks representing each video frame may be arranged into slices which represent a portion of a frame.

Because MPEG-2 allows for a wide latitude in the encoding techniques used, an MPEG-2 data stream may include I-frames on a routine basis or may not include any routine I-frames.

When I-frames are used at regular intervals, e.g., every ninth frame, the picture will be refreshed on a regular basis.

In the case where intra-coded frames are not used at regular intervals it is expected that progressive refresh will be used instead of I-frames. Both modes of refreshing the picture are allowed within MPEG-2.

When progressive refresh is used, within a certain period of time, each macroblock in the picture is coded intra at least once. The intra-coded macroblocks may occur in a regular pattern, e.g., the first row of macroblocks is forced to be intra in the first frame, the second row of macroblocks is forced to be intra in the second frame, etc. However, a regular pattern is not required and is not expected to be known by a decoder or VTR.

In addition to permitting I-frames or progressive refresh to be used, MPEG-2 also allows for various other encoding options that complicate the selection of data for use during trick play. For example, MPEG-2 permits DC coefficients to be represented with 8, 9 or 10 bits of precision, it also permits pictures to be represented in a field picture format or a frame picture format. In addition, MPEG-2 provides two different patterns to be used for converting a 2-dimensional DCT block into a 1-dimensional sequence, the default being a zig-zag scan pattern with the optional alternative being an alternate-- scan pattern. It also provides two different tables of quantization scale factor (mquant) values to be used to encode the video data, i.e., a default q-- scale-- type table and an alternate q-- scale-- type table. MPEG-2 also allows for a change of the quantization matrix from a default quantization matrix.

For a more detailed discussion of the above possible variations between MPEG-2 encoded bitstreams, see the November 1993 ISO--MPEG Committee draft referred to above.

Because intra-coded frames can be decoded without data from other frames, they are particularly well suited for used during trick play. Accordingly, it is desirable to use fully intra-coded video frames for trick play operation. However, in the progressive refresh case, fully intra-coded frames occur infrequently and at non-random intervals making it difficult to obtain a sufficient number of fully intra-coded video frames directly from the video bitstream received by a VTR to provide enough fully intra-coded frames to support trick play operation.

Accordingly, there is a need for a method and apparatus that can process a compressed video bitstream, such as an MPEG-2 video bitstream, in the progressive refresh case, to produce a sufficient number of fully intra-coded video frames to support trick play operation.

Furthermore, it is desirable that the fully intra-coded trick play video frames produced by such a method and apparatus require less data to store than comparable fully intra-coded frames intended to be displayed during VTR normal play operation.

Accordingly, there is a need for a method and apparatus that can select data for use during trick play operation from a compressed video data stream that does not include I-frames at regular intervals, and generate fully intra-coded frames suitable for use during trick play operation therefrom.

SUMMARY OF THE PRESENT INVENTION

The present invention is directed to methods and apparatus for extracting data from a video bitstream including a plurality of inter-coded video frames and for arranging the data to form fully intra-coded frames which are suitable for use as trick play video frames.

These composite fully intra-coded frames can then be recorded on a tape and later read back during VTR trick play operation to provide data sufficient to produce recognizable images or portions of images during trick play operation.

In accordance with the present invention intra-coded macroblocks of received video frames are identified, selected, processed and stored to facilitate later combination into a single fully intra-coded composite video frame suitable for use during VTR trick play operation.

The present invention provides several methods for selecting which intra-macroblocks from the bitstream should be selected for incorporation into a single composite video frame.

In accordance with a first embodiment of the present invention, intra-coded macroblocks are selected in the order they are received, processed and stored in a data storage device. In such an embodiment, each identified intra-coded macroblock is selected and stored in a memory location corresponding to the particular macroblock position within a frame to which the selected macroblock corresponds. Subsequently identified macroblocks are recorded in the same manner until intra-coded macroblocks have been stored corresponding to all the macroblock positions of the composite video frame. Intra-coded macroblocks that belong to a later temporal frame overwrite previously stored macroblocks as the process of generating a fully intra-coded frame proceeds if two identified intra-coded macroblocks correspond to the same macroblock position within a frame.

In a second embodiment of the present invention, when the intra-refresh pattern is known, only the intra-coded macroblocks that are the result of a forced refresh are selected for incorporation into the composite video frame.

In accordance with a third embodiment of the present invention, sets of intra-coded macroblocks which include a minimum preselected number of macroblocks which correspond to adjacent positions within a video frame are identified and selected as opposed to merely individual macroblocks. By selecting the minimum number of intra-coded macroblocks to be higher than the number expected to frequently occur at random, but less than the number expected to occur as the result of a forced refresh, the number of randomly occurring intra-coded macroblocks selected for incorporation into the composite fully intra-coded video frame being generated is reduced as compared to the first embodiment.

The present invention provides for other embodiments described in detail below.

In accordance with one embodiment of the present invention, after each macroblock is selected to be stored, it is processed, e.g., so that the amount of data used to represent each intra-coded macroblock is reduced and so that the macroblocks are processed so as to be represented in a consistent manner which facilitates the subsequent combination of intra-coded macroblocks from different frames into a single frame suitable for use during trick play operation.

Once enough intra-coded macroblocks have been stored to represent a fully-intra coded macroblock the stored macroblocks are processed into slices which are then used to form a fully intra-coded frame suitable for use during trick play operation.

Accordingly, by identifying, selecting, processing, storing and combining intra-coded macroblocks from a plurality of inter-coded video frames, the methods and apparatus of the present invention can be used to provide reduced resolution, fully intra-coded frames suitable for use in VTR trick play operation when a progressive refresh bitstream is being used.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic block diagram of a data extraction and frame forming circuit in accordance with one embodiment of the present invention.

FIG. 2 is a schematic block diagram of an exemplary intra-coded data identification, selection and processing circuit suitable for use with the data extraction and frame forming circuit illustrated in FIG. 1.

FIG. 3 is a schematic block diagram of an exemplary macroblock processing circuit implemented in accordance with one embodiment of the present invention.

FIG. 4 is a schematic block diagram illustrating a frame forming circuit suitable for use as the frame forming circuit of FIG. 1.

DETAILED DESCRIPTION

The present invention is directed to data extraction techniques and, more particularly, to a method and apparatus for extracting data from a video bitstream including a plurality of inter-coded video frames and arranging the data to form fully intra-coded frames. These composite fully intra-coded frames can then be recorded on a tape and later read back during VTR trick play operation to provide data sufficient to produce recognizable images or portions of images during trick play operation.

As discussed above, a video data bitstream may include I-frames that occur at regular intervals or, alternatively, use progressive refresh instead. When progressive refresh is used, within a certain period of time, each macroblock in the picture is coded intra at least once, In such a system, it is expected that within a 15 frame period, all macroblocks will be intra-coded at least once in order to insure satisfactory picture quality. The intra-coded macroblocks may occur in a regular pattern, e.g., the first row of macroblocks is forced to be intra in the first frame, the second row of macroblocks is forced to be intra in the second frame, etc. However, a regular pattern is not required and is not expected to be known by a decoder or VTR.

During trick play operation, it is desirable to display one frame, refered to as a trick play frame, for every N frames displayed during normal play operation, where N is a positive number corresponding to the speed up during trick play operation. For example, in 9× fast forward operation, it is desirable to display one trick play frame for every 9 normal play video frames.

Because of the data constraints imposed by digital tape recording systems during trick play operation, it is important that the data used to represent trick play frames include only intra-coded data and that the amount of data used to represent each trick play frame be less than the amount of data that would be required to represent a normal play video frame as a fully intra-coded video frame.

In the case of progressive refresh, each video frame is likely to contain some intra-coded macroblocks. However, fully intra-coded video frames are not routinely available. Since complete I-frame are needed for trick play operation, and are not readily available from the bit stream expected to be received by a VTR, in the case of progressive refresh, a method and apparatus are required for generating the required intra-coded trick play video frames from the received data.

In the case of progressive refresh, it is desirable to make as much use of the intra information contained in the received bit stream as possible, when selecting data to be used to represent trick play video frames. Furthermore, the intra-coded data from the data representing the normal play inter-coded video frames received by the VTR should be combined in a manner that provides the best quality trick play video frame possible.

Referring now to the drawings, and initially to FIG. 1, there is illustrated a data extraction and frame forming ("DEFF") circuit, generally indicated by the reference numeral 10, implemented in accordance with one embodiment of the present invention. As will be discussed below, the DEFF circuit 10 is suitable for receiving an encoded video bitstream, e.g., an MPEG-2 compliant bitstream, identifying intra-coded data, e.g., macroblocks within the bitstream and generating fully intra-coded video flames from the received data contained in the bitstream by, e.g., combining intra-coded macroblocks from several inner-coded frames into a single composite intra-coded video frame suitable for use during VTR trick play operation. The DEFF circuit 10, comprises a syntax parser circuit 12, an intra-coded video data identification, selection and processing ("IISP") circuit 14, a fixed length storage circuit 16, a frame forming circuit 18 and a video frame selection circuit 20.

The syntax parser 12 receives the variable length encoded video bitstream which includes a series of inter-coded video frames intended for normal play VTR operation. It also detects the frame to which received video data corresponds and generates a video frame indicator signal that is supplied to the video frame selection circuit indicating the receipt of video data corresponding to each new video frame. The syntax parser 12 parses the bitstream to identify data representing different video frames and to generate as its output MPEG coding elements, e.g., macroblocks, motion vectors, DC and AC DCT coefficients, etc. The syntax parser 12 may be thought of as performing a partial variable length decode operation in that individual MPEG coding elements are identified in the variable length encoded data stream. However, this parsing operation which is relatively simple to implement should not be confused with performing a full variable length decoding operation ("VLD" operation) as described below which is more difficult to implement.

The IISP circuit 14 has an input coupled to the output of the syntax parser 12. In this manner, the IISP circuit 14 receives the MPEG coding elements which represent a series of video frames. As will be discussed in more detail below, the IISP circuit 14 identifies the intra-coded macroblocks of each received video frame, selects from the identified intra-coded macroblocks which macroblocks to store for inclusion in a composite fully intra-coded video frame, and processes the selected intra-coded macroblocks into a format that makes them suitable for storage and which facilitates their later combination with other macroblocks into a single fully intra-coded frame.

The IISP circuit 14 outputs the selected and processed intra-coded macroblocks to the storage device 16 which is used to store intra-coded macroblocks until they are ready to be combined into a single composite fully intra-coded video frame by the frame forming circuit 18. Since, in the case of progressive refresh, intra-coded macroblocks are selected from a plurality of video frames, it is necessary to store the selected macroblocks, e.g., in the storage device 16, until enough intra-coded macroblocks have been selected to form a fully intra-coded frame.

The intra-coded macroblocks supplied by the IISP circuit 14 to the storage device 16 may come from any section of the image and are coded using variable length codes. Accordingly, to facilitate the creation of the composite intra-coded macroblock, the selected intra-coded macroblocks should be stored in such a way that each macroblock is individually accessible. This differs from the case where I-frames are provided at regular intervals where such individually accessible storage is unnecessary since all of the macroblocks arrive in order, and there is no need to identify the location where any particular macroblock's data resides in memory.

In accordance with the present invention, in one embodiment, the storage device 16 includes, for each one of the possible macroblocks positions within a video frame, a memory location having a fixed size. In this manner, the storage device 16 includes one individually accessible memory location for each macroblock of the composite video frame. While fixed size memory locations are used in the described embodiment, it is also possible to implement the storage device 16 using variable size memory locations.

The size of each of the individual memory locations of the storage device 16 must be large enough to store the largest amount of macroblock information that may be required to be stored for any given macroblock.

The fixed storage space for each macroblock could store either the variable length representation of the macroblock, or a fixed length representation with the variable length representation being a Huffman coding of the fixed length representation. Since the worst case variable length coding of a macroblock is longer than its fixed length, in accordance with one embodiment, the macroblocks are stored using a fixed length representation. In such an embodiment, the IISP circuit 14, processes each intra-coded macroblock selected for storage to convert it from a variable length representation to a fixed length representation prior to supplying it to the storage device 16.

As illustrated in FIG. 1, the frame forming circuit 18 has an input coupled to the output of the fixed length storage device 16 for receiving therefrom the intra-coded macroblocks stored therein. The frame forming circuit 18 combines the intra-coded macroblocks received from the storage device 16 into slices which are then combined to form fully intra-coded video frames which represent a composite of a plurality of video frames included in the originally received bitstream.

Via its coupling to the storage device 16, the frame forming circuit 18 can obtain from the storage device 16, the intra-coded macroblocks stored therein and generate a fully intra-coded frame therefrom as required to support the various modes, e.g., speeds of trick play operation supported by a video tape recorder incorporating the circuit 10 of the present invention. For example, the frame forming circuit 18 may generate a fully intra-coded frame, using the data stored in the storage device 16, at a rate equal to or greater than the rate required to support the lowest speed of trick play operation supported by the circuit 10 of the present invention.

Each fully intra-coded video frame output by the frame forming circuit 18 is supplied to the input of the video frame selection circuit 20. The video frame selection circuit 20 selects, as a function of the video frame indicator signal output by the syntax parser, when the fully intra-coded video frame generated by the frame forming circuit 18 is to be used during each of a plurality of different trick play speeds of operation, e.g., 3×, 9× and 27× fast forward or reverse speeds of operation, and outputs these frames, e.g., via the corresponding outputs. For example, every time the video frame selection circuit determines that three video frames have been received by the syntax parser 12, e.g., by counting that the video frame indicator signal has been asserted three times since the last time a video frame was supplied to the 3× speed output, the video frame selection circuit outputs the frame generated by the frame forming circuit 18. Similarly, the video frame selection circuit may output one frame to the 9× output every nine times the video frame indicator signal is asserted.

In an alternative embodiment when the average time of a video frame is known, the video frame selection circuit uses the video frame indicator signal as a synchronization signal and supplies frames generated by the frame forming circuit 18 to the different speed outputs as a function of the amount of time that passes.

For example, when sufficient time passes to have displayed three video frames, the frame generated by the frame forming circuit 18 is supplied to the 3× speed output of the video frame selection circuit 20 for recording e.g., in a 3× fast scan track segment. Using this timed approach frames may be selected and output at non-integer multiples of the number of received video frames to support non-integer trick play speeds of VTR operation, e.g., 2.5 times fast forward speed, etc. Furthermore, in this embodiment, the syntax parser 12 need not generate a video frame indicator signal.

The fully intra-coded digital video frames output via the various speed outputs of the video frame selection circuit can be supplied to one or more buffers prior to recording on a tape in specific tape locations which are arranged to be read during VTR trick play operation when the VTR operates at the specific speeds and directions of trick play for which the data frames are selected.

The operation of the IISP circuit 14 will now be described in greater detail with reference to FIG. 2. As illustrated, the IISP circuit 14 comprises an intra-coded macroblock identification circuit 30, a macroblock selection circuit 32, a data table 34 and a macroblock processing circuit 36.

The intra-coded macroblock identification circuit 30 receives the MPEG coding elements output by the syntax parser 12 and identifies individual intra-coded macroblock and/or sets of adjacent intra-coded macroblocks that correspond to each of the received video frames. The identified intra-coded macroblocks are then supplied to the macroblock selection circuit 32 which is responsible for selecting which of the identified intra-coded macroblocks are to be processed and stored in the fixed length storage device 16.

As stated earlier, when progressive refresh is used, intra-coded macroblocks will occur throughout several frames, and they need to be identified, selected, processed and combined to form one fully intra-coded frame suitable for trick play. While the intra-coded macroblocks may be forced to occur in a regular pattern, a regular pattern is not required and will probably be unknown to the VTR even if such a pattern exists. Significantly, intra-coded macroblocks other than those that are being forced intra for refresh purposes will occur on an irregular basis as the result of the original encoding process. For each intra-coded macroblock that arrives a decision must be made on whether it will be selected for storing in the storage device 16 for possible inclusion in the fully intra-coded frame being produced.

In accordance with a first embodiment of the present invention, intra-coded macroblocks are selected in the order they are received, processed and stored in the data storage device 16. In such an embodiment, each identified intra-coded macroblock is selected and stored in the memory location corresponding to the particular macroblock position within a frame to which the selected macroblock corresponds. Subsequently identified macroblocks are recorded in the same manner until intra-coded macroblocks have been stored corresponding to all the macroblock positions of the composite video frame. Intra-coded macroblocks that belong to a later temporal frame overwrite previously stored macroblocks as the process of generating a fully intra-coded frame proceeds if two identified intra-coded macroblocks correspond to the same macroblock position within a frame.

Data on the contents of each macroblock memory location is stored in the data table 34. Accordingly, the macroblock selection circuit 32 can determine when it has completed storing enough fully intra-coded macroblocks to represent one complete fully intra-coded video frame.

After a sufficient number of fully intra-coded macroblocks have been stored to represent a complete fully intra-coded video frame have been stored, the process of storing intra-coded macroblocks continues resulting in a constant updating of the macroblocks stored in the storage device 16. Accordingly, as the frame forming circuit 18 repeatedly accesses the stored data to generate fully intra-coded video frames, as required to support the various trick play modes of operation supported by the video frame selection circuit 20, it is constantly receiving updated data which is used to generate a new fully intra-coded video frame.

While the above first embodiment offers one method for selecting intra-coded macroblocks from multiple frames, for incorporation into a single composite fully intra-coded video frame, the above method fails to take into consideration the placement of macroblocks within a frame when selecting intra-coded macroblocks to be incorporated into the composite intra-coded frame being generated.

The best trick play image quality is expected to result when a large number of neighboring macroblocks are updated at the same time, e.g., during the same frame. This is particularly important when there is a lot of motion in the image sequence. The trick play image quality is expected to be poor for moving sequences when the intra refresh macroblocks from different video frames are scattered throughout the image rather than being concentrated in one place. When data extraction is used with I frames, it is expected that the most recent I frame will typically be used as the trick play frame. But in the progressive refresh case, it is not necessarily desirable that the most recent intra-coded macroblocks be used if this will result in macroblocks from different video frames being scattered throughout the fully intra-coded video frame being generated.

In a progressive refresh scheme, which has a regular intra-refresh pattern, occasional other macroblocks outside of the refresh region will be coded intra. If a regular intra refresh pattern exists, and macroblocks forced intra for a give picture are generally neighboring one-another, it is best to use those, and only those forced intra-coded macroblocks in a trick play frame, i.e., avoid the use the randomly occurring other intra-coded macroblocks.

If the refresh pattern is known, i.e., the refresh pattern corresponds to a preselected refresh pattern, this is easy to accomplish. For example, if frame one has macroblock rows 1-10 intra coded for its refresh pattern, and frame 2 has macroblock row 11-20 coded intra for its refresh patten, but frame 2 also happens to have a macroblock in row 5 coded intra as well, it is probably better not to overwrite the macroblock in row 5 over the frame 1 data, as that would result in just a single macroblock from a different frame, frame 5, in a section otherwise containing all frame 1 data.

Accordingly, in a second embodiment of the present invention, when the intra-refresh pattern is known, it is programmed into the macroblock selection circuit which then selects only the intra-coded macroblocks that are the result of a forced refresh.

However, when the intra refresh pattern is unknown, such an approach to intra-coded macroblock selection is not possible.

A modification to the first of the above described approaches to selecting intra-coded macroblocks, i.e., merely selecting intra-coded macroblocks in the temporal order in which they occur, offers one approach to minimizing the number of randomly occurring intra-coded macroblocks that are selected by the macroblock selection circuit 32 as opposed to macroblocks which occur as the result of a forced refresh operation.

In accordance with a third embodiment of the present invention, sets of intra-coded macroblocks which include a minimum preselected number of macroblocks which correspond to adjacent positions within a video frame are identified and selected as opposed to merely individual macroblocks. By selecting the minimum number of intra-coded macroblocks to be higher than the number expected to frequently occur at random, but less than the number expected to occur as the result of a forced refresh, the number of randomly occurring intra-coded macroblocks selected for incorporation into the composite fully intra-coded video frame being generated is reduced. Identifying and selecting sets of intra-coded macroblocks which include at least 10 macroblocks which correspond to adjacent positions within a video frame should produce satisfactory results.

As in the case of the first embodiment, the selected macroblocks are processed and stored until enough intra-coded macroblocks have been stored to produce a fully intra-coded frame at which time the data table 34 is cleared and the process of generating a fully intra-coded frame from the received video data is permitted to continue resulting in a constant updating of the data stored in the storage device 16.

A fourth embodiment, uses an approach to selecting macroblocks that is based on identifying all the intra-coded macroblocks that are received and then deciding whether to store each identified macroblock as a function of how long it has been since a particular macroblock location has been refreshed and how many of the neighboring macroblocks of the presently stored macroblock corresponding to a particular location are coded intra with preference being given to many macroblocks being grouped together. Accordingly, this fourth embodiment may be viewed as a combination of the third and first embodiments.

In accordance with this fourth embodiment of selecting intra-coded macroblocks, upon start-up, fully intra-coded macroblocks are stored in the macroblock memory locations in the storage device 16 in the order they are received, and the data table is updated until enough macroblocks are stored to generate a fully intra-coded free.

Once enough intra-coded macroblocks have been stored to generate a fully intra-coded video frame the data selection process proceeds as described below.

When an intra-coded macroblock arrives, if it is the first intra-coded macroblock for that position since a predetermined number of video frames have been received, e.g., 15 video frames ago which is the time period in which it is expected that all macroblocks will have been forced intra-coded at least once, then the macroblock is selected to be stored. With the storing of the macroblock, the data table 34 is updated to indicate that a macroblock corresponding to the particular location has been stored and to which of the received video frames the stored macroblock corresponds.

Received intra-coded macroblocks are also selected for recording if they belong to a set of adjacent intra-coded macroblocks if certain conditions are met as described below. In accordance with the fourth embodiment, identified sets of adjacent intra-code macroblocks of each received video frame are compared to the stored macroblocks via the use of the data table 34 to determine whether the identified set of macroblocks is larger than a corresponding previously stored set of macroblocks. If a subsequently identified set of macroblocks overlaps a set of previously stored intra-coded macroblocks corresponding to the same macroblock positions within a frame and is larger than the previously stored set, then the identified set of macroblocks is stored overwriting the previously stored macroblocks corresponding to the overlapping macroblock positions.

This process of identifying and selecting intra-coded macroblocks from a plurality of received video frames is repeated on an ongoing basis with the intra-coded macroblocks stored in the storage device 16 being supplied to the frame forming circuit 18 as required to meet the needs of the video frame selection circuit 20.

As discussed briefly above, after selection of a macroblock for storage but prior to its storage in the storage device 16, each selected macroblock is processed to facilitate its storage and combination with other intra-coded macroblocks from different frames to produce a single fully intra-coded video frame.

The operation and circuity of the macroblock processing circuit 36 will now be described with reference to FIG. 3. The macroblock processing circuit 36 is responsible, in various embodiments, to perform processing on the selected macroblocks to, e.g., reduce the amount of data used to represent each macroblock and to insure that macroblocks are represented in a consistent manner that facilitates their subsequent combination into a single frame. Since full resolution of the macroblocks is not required for trick play, the use of lower resolution versions of macroblocks provides a viable way of reducing the amount of memory required to store each selected macroblock and thereby reduce the amount of memory need to implement the storage device 16.

In one embodiment, the DC coefficient for each one of the blocks of a selected macroblock is used to represent the macroblock. In such an embodiment, the macroblock processing circuit 36 is responsible for processing the selected macroblocks to remove the AC DCT coefficients from each selected macroblock before storing in the storage device 16.

As illustrated in FIG. 3, the macroblock processing circuit 36 includes a DCT coefficient filter circuit 37 for removing AC DCT coefficients from each macroblock prior to storage. The filter circuit 37 is incorporated into the macroblock processing circuit 36 when it is desired to use the DC DCT coefficients without the AC DCT coefficients, e.g., to reduce data storage requirements, to represent the selected macroblocks. The output of the filter circuit 37 is coupled to a difference operation circuit 35.

If more than one intra-macroblock arrives consecutively within a slice, the DC DCT coefficients will arrive differentially encoded. In accordance with the present invention the difference operation circuit 35 reverses the difference operation for differentially encoded macroblocks prior to their storage. Accordingly DC DCT coefficients are stored in the storage device 16 using their actual values. This facilitates the later combination of the Stored intra-coded macroblocks into slices and ultimately a fully intra-coded video frame.

For better image quality, at the cost of grater complexity, more than just the DC DCT coefficients of each macroblock can be used to represent the selected intra-frame macroblocks. For example, the first 8 amplitude/runlength pairs may be used, in addition to the DC DCT coefficients, to represent each selected macroblock.

In accordance with the present invention, when less than a low resolution representation of a selected macroblock is stored, as opposed to a full resolution representation, the mquant value associated with the low resolution representation is stored along with the actual macroblock data.

As illustrated in FIG. 3, the macroblock processing circuit 36, further comprises a DC DCT coefficient precision control circuit 38, which is coupled to a picture structure control circuit 39. The picture control circuit 39 is, in turn, coupled to the input of a variable length decoder circuit 40. The variable length decoder circuit 40 has an output coupled to the input of an intra-- vlc-- format control circuit which, in turn, has an output coupled to the input of an inverse scan/inverse quantization circuit 42. The output of the circuit 42 is coupled to the input of a quantizor 44 which has an output coupled to the input of a variable length encoder circuit 46.

As discussed above, the various circuits of the macroblock processing circuit operate together to process the macroblocks selected for storing in the storage device 16 so that they can be later combined into a single fully intra-coded video frame. They also serve to reduce the amount of data required to represent the macroblocks corresponding to a video frame and to thereby reduce the amount of data required to represent a video frame.

Accordingly, the macroblock processing circuit 36 may be used as a data reduction circuit, e.g., to process the macroblocks corresponding to an I-frame and to produce a low resolution I-frame therefrom in a system where I-frames are available.

Circuits 35, 38, and 39 are used to process the DC DCT coefficients of the selected macroblocks. Circuits 40, 42, 44, and 46 on the other hand, which are used to process AC DCT coefficients, are unnecessary if only DC DCT coefficients are used to represent the selected macroblocks. Accordingly, in some embodiments, e.g., where filter circuit 37 is used, circuits 40, 42, 44, and 46 are omitted from the macroblock processing circuit 36.

Because of the great flexibility of MPEG-2, there are difficulties that can arise when combining macroblocks from several frames into a single frame. Some of the parameters that MPEG-2 allows to be changed for each picture that can cause difficult when combining several pictures with different values into a single intra-coded frame are: intra-- dc-- precision, intra-- vlc-- format, picture structure, q-- scale-- type, alternate-- scan, and top-- field first. The first of these parameters is of interest when only DC coefficients are being used while the remaining four parameters are of interest when DC and AC coefficients are used.

The circuits of the macroblock processing circuit 36 are designed to resolve the problems that can be associated with the various parameters that MPEG-2 permits to be altered as will be discussed below.

The parameter intra-- dc-- precision is used to indicate the number of bits of precision used to represent DC DCT coefficients. In MPEG-2, DC DCT coefficients may be represented with 8, 9, or 10 bits of precision. In order to insure consistency in the way DC DCT coefficients are represented, the DC DCT coefficient control circuit 38 detects the degree of precision used and reduces the precision to 8, if 9 or 10 bits of precision were used to represent the DC DCT coefficients of the selected macroblocks. For inputs with 9 or 10 bits of precision, the operation requires simply dropping 1 or 2 bits, respectively. Such a decrease in precision should not have a significant impact on image quality and should reduce memory requirements for the storage device 16 since it need not be capable of storing the additional two bits of precision which are dropped for each DC DCT coefficient.

In MPEG-2 the parameter intra-- vlc-- format is used to indicate which one of two different VLC tables, the default or the alternate, is used for representing amplitude/runlength coefficients in intra-coded macroblocks.

In accordance with one embodiment of the present invention, after variable length decoding is performed on the macroblocks being processed by the variable length decoder circuit 40, the intra-- vlc-- format control circuit detects when the macroblocks output by the decoder are represented using the alternate-- vlc-- format and then processes the detected macroblocks to map them into the default intra-- vlc-- format so that all the macroblocks are represented using the default intra-- vlc-- format. The default intra-- vlc-- format is the better intra-- vlc-- format for data reduction purposes because an End of Block (EOB) symbol which is required by MPEG-2 for each macroblock, is represented using 2 bits in the default intra-- vlc-- format but represented using 4 bits in the alternate intra-- vlc-- format. Accordingly, the data reduction achieved by using the default intra-- vlc-- format as opposed to the alternate intra-- vlc-- format can be significant particularly when large amount of data reduction are performed, e.g., when only DC DCT coefficients are used.

In MPEG-2 the parameter picture-- structure is used to indicate whether a picture is being represented as a field picture or a frame picture. There is a problem when trying to combine macroblocks from both field pictures and frame pictures into the same picture, because one macroblock in one type overlaps two macroblocks in the other type.

In accordance with the present invention, in one embodiment, macroblock storage is based on frame pictures. In such an embodiment, the picture structure control circuit 39, detects When selected macroblocks representing field pictures arrive, and then proceeds to map the detected macroblocks' DCT coefficients into both of the macroblocks it overlaps in a frame picture format.

In an alternate embodiment of the present invention, macroblock storage is based on field pictures. In such an embodiment, the picture structure control circuit 39, detects when selected macroblocks representing frame pictures arrive, and then proceeds to map the detected macroblocks' DCT coefficients into the macroblock it overlaps in field picture format.

In the above manner, by mapping the macroblocks into either a frame picture format of a field picture format it is possible to store the received macroblocks in a consistent format that readily permits their combination into a single fully intra-coded video frame comprising macroblocks from a plurality of different video frames.

The alternate-- scan, q-- scale-- type and quant-- matrix-- extension parameters are only important when AC DCT coefficients are used in conjunction with DC DCT coefficients to represent the selected intra-coded macroblocks being stored.

The alternate-- scan parameter indicates which one of two different scan patterns for converting the 2-dimensional DCT block into a 1-dimensional sequence, for amplitude/runlength coding, was used to generate a selected macroblock.

In accordance with the present invention after variable length decoding is performed by the variable length decoder circuit 40, the inverse scan/inverse quantizer circuit 42 maps any alternate-- scan macroblock into the default zig-zag scan pattern. With such a remapping operation, there is no loss in picture quality. It should be noted that this remapping operation is not needed for DC DCT coefficients because the DC DCT coefficient is the first coefficient for both of the two possible scan methods.

The parameter q-- scale-- type is used to indicate which of two tables is used to convert the mquant into a quantization scale multiplier. In accordance with the present invention, the default q-- scale-- type will be used for trick play pictures. If the effective multiplier for the alternate q-- scale-- type can be represented by a mquant value of the default q-- scale-- type, the non default type mquant values are simply changed by the inverse scan/inverse quantize circuit to the corresponding default q-- scale-- type value. However, if the effective multiplier does not exist, in one embodiment, the closest existing value of mquant is used. Unfortunately, while this approach has the advantage of being relatively simple to implement, it has an adverse impact on image quality.

As an alternative to using the closest standard mquant value, in the embodiment illustrated in FIG. 3, the inverse quantization circuit 42 is used in combination with the quantization circuit 44 to inverse quantize the macroblock with the correct scale factor and then requantize it with the closest mquant value in the default table. While the implementation cost of this approach is expected to be higher then the previously described approach, it is should produce less of a decrease in image quality. There is no need to address the issue of q-- scale-- type for DC DCT coefficients because the DC DCT coefficient is not quantized below 8 bits in MPEG-2.

The parameter quant-- matrix-- extension allows for a change in the quantization matrix from the default quantization matrix. When a quantization matrix other than the default matrix is used it is necessary to inverse quantize using the input quantization matrix and requantize using the default quantization matrix. The inverse quantization circuit 42 and quantization circuit 44 are used for this function when it is detected that a non-default quantization matrix was originally used to quantize the selected macroblocks.

The algorithm of the present invention for processing selected macroblocks to insure that they conform to the same parameters may be described by the following sequence of operations: variable length decode, inverse zigzag scan, inverse quantize, requantize, zig-zag scan and variable length encode. The variable length encoding of the selected and processed macroblocks is performed by the variable length coding ("VLC") circuit 46 just prior to the selected intra-coded macroblocks being stored in the storage device 18.

It should be noted that when the selected and processed macroblocks are to be stored in fixed length format, variable length encoding is not performed prior to storage but rather after storage. Accordingly, in such an embodiment, the variable length encoder 46 is located between the storage device 16 and the frame forming circuit 18 and not between the quantizer 44 and the storage device 16 as illustrated in the embodiment of FIG. 3.

To insure that the AC DCT coefficients are stored in a consistent manner the variable length decoder circuit 40, inverse scan/inverse quantize circuit 42, quantization circuit 44 and variable length decoder circuit 40 are used.

Referring now to FIG. 4, the operation of the frame forming circuit 18 will be described in greater detail. The frame forming circuit 18 is responsible for receiving from the storage device 16 the set of intra-coded macroblocks that have been selected to represent the composite fully intra-coded video frame being generated and to process the intra-coded macroblocks into a single video frame, e.g., an MPEG-2 compliant video frame.

The frame forming circuit 18 includes a differential encoding and slice forming circuit 50 that receives the intra-coded macroblocks from the fixed storage device 16 and differentially encodes the intra-coded macroblocks into slices.

The slices may be of any size, e.g., number of macroblocks, from one macroblock upto the total number of macroblocks that comprise an entire row, as permitted by MPEG-2. The use of slices with a large number of macroblocks to represent a frame will require less data than representing the same frame using a larger number of slices with fewer macroblocks each. However, it should be noted that the use of large slices will tend to propagate errors throughout a larger area of the frame and therefore may be less desirable in some cases than the use of more smaller slices to represent a frame.

The slices generated by the differential encoding and slice forming circuit are supplied to the slice arranging circuit 52 which adds appropriate header information and arranges the slices into the fully intra-coded frame being generated. The fully intra-coded frame generated by the slice arranging circuit 52 is supplied to the input of the video frame selection circuit 20 which selects fully intra-coded frames to be used for different speeds and directions of VTR operation.

While the above method and apparatus are designed to extract intra-coded data from an MPEG-2 compliant bitstream when progressive refresh is used, the circuit 10 can be simplified if certain restrictions are made at the time of encoding, i.e., at the time the progressive refresh bitstream is produced, to make subsequent data extraction simpler. The present invention contemplates two restrictions with two associated simplifications.

The first restriction is to not allow the following parameters to change for different pictures of the same sequence as permitted by MPEG-2: alternate-- scan, intra-- dc-- precision, intra-- vlc-- format, q-- scale-- type, the quant-- matrix, picture-- structure and top-- field first. With these restrictions, the use of the inverse quantizer, quantizer, inverse scan, and zig-zag scan are no longer needed for data extraction. However, the VLD and VLC operations will still be needed in some cases and low resolution fixed length frame storage will also probably still be required.

If a second restriction is also made, i.e., that the progressive intra-refresh always updates entire rows of macroblocks ("a stripe"), than the VLD and VLC operation will not be required. Instead algorithms used for selecting I-frames, such as those discussed in U.S. patent application Ser. No. 08/298,524, titled "METHOD AND APPARATUS FOR THE SELECTION OF DATA FOR USE IN VTR TRICK PLAYBACK OPERATION IN A SYSTEM USING INTRA-CODED VIDEO FRAMES" filed on even date herewith and expressly incorporated by reference, can be used, where codewords are merely parsed and selected for inclusion in the bitstream. However, while the maximum size of a trick play compressed frame, e.g., 1 Mbit, serves as the maximum data limitation in the case when I-frames are being used for trick play, for progressive refresh with the "stripe" restriction, each stripe must fit into a fixed length area, the Size of which is the maximum data limitation when I-frames are being used divided by the number of stripes, e.g. 1 Mbit divided by the number of stripes. While some quality may be lost as a result of this restriction, acceptable fully intra-coded frames for trick play use should still result.

Claims (6)

What is claimed is:
1. An apparatus for processing an intra-coded video frame including a plurality of macroblocks, each macroblock including DC DCT coefficients and AC DCT coefficients, the DC DCT coefficients being represented by 8, 9, or 10 bits of precision, the apparatus comprising:
a DCT coefficient filter for receiving the plurality of macroblocks and for removing from the plurality of macroblocks the AC DCT coefficients; and
a DC DCT coefficient precision control circuit coupled to the DCT coefficient filter for detecting the DC DCT coefficients included in the macroblocks that are represented using 9 or 10 bits of precision and for converting the detected DC DCT coefficients to 8 bits of precision, the macroblocks processed by the DCT coefficient filter and the DC DCT coefficient precision control circuit representing the intra-coded video frame with less data than the received plurality of macroblocks.
2. The apparatus of claim 1, wherein each of the plurality of macroblocks is one of a default intra-- vlc-- format type or an alternate intra-- vlc-- format type and wherein the apparatus further comprises:
means for detecting macroblocks of the alternate intra-- vlc-- format type and for converting the detected macroblocks to the default intra-- vlc-- format type.
3. A method for processing an intra-coded video frame, the digital data repressing the intra-coded frame including a plurality of macroblocks, each macroblock including DC DCT coefficients and AC DCT coefficients, the method comprising the steps of:
receiving the digital data representing the intra-coded frame including the plurality of macroblocks;
filtering the received digital data representing the intra-coded frame to remove the AC DCT coefficients from each one of the plurality of macroblocks, the filtered digital data representing the intra-coded frame with less data than the received video data; and
storing the filtered digital data representing the intra-coded frame using a non-volatile digital storage media.
4. The method of claim 3, wherein the DC DCT coefficients of each one of the plurality of macroblocks include one of 8, 9 and 10 bits of precision, the method further comprising the steps of:
identifying ones of the plurality of macroblocks represented using one of 9 and 10 bits of precision; and
converting the identified ones of the plurality of macroblocks to include only 8 bits of precision.
5. The method of claim 4, wherein each of the plurality of macroblocks is one of a default intra-- vlc-- format type or an alternate intra-- vlc-- format type and wherein the method further comprises the step of:
detecting macroblocks of the alternate intra-- vlc-- format type; and
converting the detected macroblocks to the default intra-- vlc-- format type.
6. The method of claim 3, wherein the non-volatile digital storage media is a tape.
US08/616,303 1993-01-13 1996-03-15 Intra-coded video frame data processing methods and apparatus Expired - Fee Related US5726711A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US415893A true 1993-01-13 1993-01-13
US08/228,949 US5805762A (en) 1993-01-13 1994-04-18 Video recording device compatible transmitter
US08/298,015 US5778143A (en) 1993-01-13 1994-08-30 Method and apparatus for the selection of data for use in VTR trick playback operation in a system using progressive picture refresh
US08/616,303 US5726711A (en) 1993-01-13 1996-03-15 Intra-coded video frame data processing methods and apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/616,303 US5726711A (en) 1993-01-13 1996-03-15 Intra-coded video frame data processing methods and apparatus

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US08/298,015 Division US5778143A (en) 1992-09-01 1994-08-30 Method and apparatus for the selection of data for use in VTR trick playback operation in a system using progressive picture refresh

Publications (1)

Publication Number Publication Date
US5726711A true US5726711A (en) 1998-03-10

Family

ID=27357578

Family Applications (1)

Application Number Title Priority Date Filing Date
US08/616,303 Expired - Fee Related US5726711A (en) 1993-01-13 1996-03-15 Intra-coded video frame data processing methods and apparatus

Country Status (1)

Country Link
US (1) US5726711A (en)

Cited By (68)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999065239A2 (en) * 1998-06-11 1999-12-16 Koninklijke Philips Electronics N.V. Trick play signal generation for a digital video recorder
EP1028593A2 (en) * 1999-02-11 2000-08-16 PacketVideo Corporation Method and device for control and delivery of digitally compressed visual data in a heterogeneous communication network
US6175592B1 (en) * 1997-03-12 2001-01-16 Matsushita Electric Industrial Co., Ltd. Frequency domain filtering for down conversion of a DCT encoded picture
US6304295B1 (en) * 1998-09-18 2001-10-16 Sarnoff Corporation Region-based refresh strategy for video compression
US6463101B1 (en) * 1998-03-19 2002-10-08 Kabushiki Kaisha Toshiba Video encoding method and apparatus
US20020194613A1 (en) * 2001-06-06 2002-12-19 Unger Robert Allan Reconstitution of program streams split across multiple program identifiers
US20030012561A1 (en) * 2001-07-12 2003-01-16 Willis Donald Henry Modifying video signals by converting non-intra pictures
US6574277B1 (en) * 1998-11-25 2003-06-03 Nec Corporation Moving-picture coding apparatus and method
WO2003055209A1 (en) 2001-12-19 2003-07-03 Thomson Licensing S.A. Trick mode playback of recorded video
US20030123664A1 (en) * 2002-01-02 2003-07-03 Pedlow Leo M. Encryption and content control in a digital broadcast system
US20030133570A1 (en) * 2002-01-02 2003-07-17 Candelore Brant L. Star pattern partial encryption
US20030152224A1 (en) * 2002-01-02 2003-08-14 Candelore Brant L. Video scene change detection
US20030152226A1 (en) * 2002-01-02 2003-08-14 Candelore Brant L. Slice mask and moat pattern partial encryption
US20030156718A1 (en) * 2002-01-02 2003-08-21 Candelore Brant L. Progressive video refresh slice detection
US20030159140A1 (en) * 2002-01-02 2003-08-21 Candelore Brant L. Selective encryption to enable multiple decryption keys
US20030159139A1 (en) * 2002-01-02 2003-08-21 Candelore Brant L. Video slice and active region based dual partial encryption
US20030161540A1 (en) * 2001-10-30 2003-08-28 Bops, Inc. Methods and apparatus for video decoding
US20030174837A1 (en) * 2002-01-02 2003-09-18 Candelore Brant L. Content replacement by PID mapping
US20030206590A1 (en) * 2002-05-06 2003-11-06 Koninklijke Philips Electronics N.V. MPEG transcoding system and method using motion information
US20030222994A1 (en) * 2002-05-28 2003-12-04 Sony Electronics Inc. Method and apparatus for synchronizing dynamic graphics
WO2004008735A2 (en) * 2002-07-16 2004-01-22 Nokia Corporation A method for random access and gradual picture refresh in video coding
US20040044008A1 (en) * 2000-06-01 2004-03-04 Daugan Alain Claude-Marie Use of therapeutic benzamide derivatives
US20040047470A1 (en) * 2002-09-09 2004-03-11 Candelore Brant L. Multiple partial encryption using retuning
US20040049688A1 (en) * 2001-06-06 2004-03-11 Candelore Brant L. Upgrading of encryption
US20040129721A1 (en) * 2001-03-06 2004-07-08 Alessandro Bianchini Apparatus and method for working plastic material and container for fluid product
EP1438851A1 (en) * 2001-10-05 2004-07-21 Thomson Licensing S.A. Slow forward trick mode playback of recorded video
US20040187161A1 (en) * 2003-03-20 2004-09-23 Cao Adrean T. Auxiliary program association table
US20040240668A1 (en) * 2003-03-25 2004-12-02 James Bonan Content scrambling with minimal impact on legacy devices
US20050028193A1 (en) * 2002-01-02 2005-02-03 Candelore Brant L. Macro-block based content replacement by PID mapping
US20050036067A1 (en) * 2003-08-05 2005-02-17 Ryal Kim Annon Variable perspective view of video images
US20050066357A1 (en) * 2003-09-22 2005-03-24 Ryal Kim Annon Modifying content rating
US20050097597A1 (en) * 2003-10-31 2005-05-05 Pedlow Leo M.Jr. Hybrid storage of video on demand content
US20050094808A1 (en) * 2003-10-31 2005-05-05 Pedlow Leo M.Jr. Dynamic composition of pre-encrypted video on demand content
US20050094809A1 (en) * 2003-11-03 2005-05-05 Pedlow Leo M.Jr. Preparation of content for multiple conditional access methods in video on demand
US20050097596A1 (en) * 2003-10-31 2005-05-05 Pedlow Leo M.Jr. Re-encrypted delivery of video-on-demand content
US20050102702A1 (en) * 2003-11-12 2005-05-12 Candelore Brant L. Cablecard with content manipulation
US20050129233A1 (en) * 2003-12-16 2005-06-16 Pedlow Leo M.Jr. Composite session-based encryption of Video On Demand content
US20050169473A1 (en) * 2004-02-03 2005-08-04 Candelore Brant L. Multiple selective encryption with DRM
US20050192904A1 (en) * 2002-09-09 2005-09-01 Candelore Brant L. Selective encryption with coverage encryption
US20060115083A1 (en) * 2001-06-06 2006-06-01 Candelore Brant L Partial encryption and PID mapping
US7068716B1 (en) * 2001-03-15 2006-06-27 Bigband Networks, Inc. Method and system for compressing groups of basic media data units
GB2429593A (en) * 2005-08-26 2007-02-28 Electrosonic Ltd Data compressing using a wavelet compression scheme
US7215770B2 (en) 2002-01-02 2007-05-08 Sony Corporation System and method for partially encrypted multimedia stream
US20070189710A1 (en) * 2004-12-15 2007-08-16 Pedlow Leo M Jr Content substitution editor
US7263187B2 (en) 2003-10-31 2007-08-28 Sony Corporation Batch mode session-based encryption of video on demand content
US20070208668A1 (en) * 2006-03-01 2007-09-06 Candelore Brant L Multiple DRM management
US7286667B1 (en) 2003-09-15 2007-10-23 Sony Corporation Decryption system
US7366239B1 (en) 2005-01-26 2008-04-29 Big Band Networks Inc. Method and system for compressing groups of basic media data units
US7418037B1 (en) 2002-07-15 2008-08-26 Apple Inc. Method of performing rate control for a compression system
US20080260266A1 (en) * 2006-10-23 2008-10-23 Fujitsu Limited Encoding apparatus, encoding method, and computer product
US20090180025A1 (en) * 2002-05-28 2009-07-16 Sony Corporation Method and apparatus for overlaying graphics on video
US20100166079A1 (en) * 2008-12-31 2010-07-01 Nxp B.V. System and method for providing fast trick modes
US7769084B1 (en) * 2002-07-15 2010-08-03 Apple Inc. Method for implementing a quantizer in a multimedia compression and encoding system
US7804897B1 (en) 2002-12-16 2010-09-28 Apple Inc. Method for implementing an improved quantizer in a multimedia compression and encoding system
US7853980B2 (en) 2003-10-31 2010-12-14 Sony Corporation Bi-directional indices for trick mode video-on-demand
US20110051802A1 (en) * 2009-08-27 2011-03-03 Nxp B.V. System and method for video compression using non-linear quantization and modular arithmetic computation
US7940843B1 (en) 2002-12-16 2011-05-10 Apple Inc. Method of implementing improved rate control for a multimedia compression and encoding system
US20110182360A1 (en) * 2002-07-14 2011-07-28 Thomas Pun Encoding video
US8041190B2 (en) 2004-12-15 2011-10-18 Sony Corporation System and method for the creation, synchronization and delivery of alternate content
CN101505425B (en) 2009-03-11 2011-11-23 北京中星微电子有限公司 Macro block filtering method and apparatus
US8185921B2 (en) 2006-02-28 2012-05-22 Sony Corporation Parental control of displayed content using closed captioning
WO2012054187A3 (en) * 2010-10-21 2012-06-14 Motorola Solutions, Inc. Method and apparatus for non-linear decoding of video frames of a video stream encoded using an intra macroblock refresh process
US8249141B1 (en) 2007-07-13 2012-08-21 Sprint Spectrum L.P. Method and system for managing bandwidth based on intraframes
CN104429069A (en) * 2012-04-13 2015-03-18 夏普株式会社 Devices for identifying a leading picture
EP2807821A4 (en) * 2012-01-23 2016-06-15 Beamr Imaging Ltd Method and system for controlling video frame encoding
US20160261920A1 (en) * 2009-11-30 2016-09-08 Time Warner Cable Enterprises Llc Methods and apparatus for supporting vod requests in a system with hierarchical content stores
US9491464B2 (en) 2011-08-29 2016-11-08 Beamr Imaging Ltd Controlling a video content system by computing a frame quality score
US9992252B2 (en) 2015-09-29 2018-06-05 Rgb Systems, Inc. Method and apparatus for adaptively compressing streaming video

Citations (56)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3934268A (en) * 1967-08-02 1976-01-20 Sony Corporation System for magnetically recording and reproducing still video pictures and audio information
US4031548A (en) * 1974-09-30 1977-06-21 Sony Corporation Plural receiving and recording television system
US4139867A (en) * 1976-09-18 1979-02-13 Robert Bosch Gmbh Method for fast- and slow-motion reproduction of video signals stored in a succession of parallel tracks on a record medium
US4193098A (en) * 1977-03-24 1980-03-11 Spin Physics, Inc. Segmented video playback apparatus with ancillary recording medium
US4263623A (en) * 1979-04-02 1981-04-21 Eastman Kodak Company Slow-frame video camera/recorder and image-sensing and signal processing device for use therewith
US4290087A (en) * 1978-06-19 1981-09-15 Spin Physics, Inc. Coarse and fine control of segmented video playback apparatus with ancillary recording medium
US4339775A (en) * 1980-06-16 1982-07-13 Eastman Technology, Inc. Fast frame rate augmentation
US4355324A (en) * 1980-03-03 1982-10-19 Rca Corporation Sampled or digitized color in a high speed search record and replay system
US4392162A (en) * 1979-10-04 1983-07-05 Sony Corporation Digital video signal reproducing apparatus
US4504869A (en) * 1982-09-20 1985-03-12 Rca Corporation Color moviola for two-track VTR
US4510538A (en) * 1981-12-14 1985-04-09 Sony Corporation Magnetic recording apparatus
US4541020A (en) * 1981-07-22 1985-09-10 Olympus Optical Co., Ltd. Data recording/reproducing apparatus
US4558376A (en) * 1980-12-03 1985-12-10 Robert Bosch Gmbh Method and system of reproduction of magnetically recorded video signals at speeds differing from recording speed
US4584613A (en) * 1980-08-20 1986-04-22 Sony Corporation Apparatus for recording video signals at a plurality of different recording speeds
US4636879A (en) * 1983-07-06 1987-01-13 Ricoh Company, Ltd. VTR system
US4636874A (en) * 1983-03-15 1987-01-13 U.S. Philips Corporation System for reproducing information signals on a magnetic tape which incrementally adjusts, in a plurality of steps the speed of the magnetic tape and the positioning and rotational speed of the magnetic head upon a change of mode
US4668998A (en) * 1984-01-31 1987-05-26 Sony Corporation Time base correction for VTR with variable tape speed
US4783707A (en) * 1978-04-13 1988-11-08 Canon Kabushiki Kaisha Automatic control means for a picture image recording device
US4807053A (en) * 1986-06-05 1989-02-21 U.S. Philips Corporation Method and apparatus for recording and/or reproducing video information in/for a record carrier, and record carrier obtained by means of the method
US4825301A (en) * 1987-07-16 1989-04-25 Polaroid Corporation Apparatus for encoding and decoding high resolution still images and video images for recording on a standard storage media
US4887169A (en) * 1986-04-04 1989-12-12 Matsushita Electric Industrial Co., Ltd. Video signal recording and playback apparatus having varied-speed playback capability
US4910605A (en) * 1986-02-18 1990-03-20 Matsushita Electric Industrial Co., Ltd. Video signal recording method and apparatus for field-segment recording
EP0367264A2 (en) * 1988-11-02 1990-05-09 Sanyo Electric Co., Ltd. A digital video tape recorder capable of high speed image reproduction
US4985781A (en) * 1986-04-15 1991-01-15 Canon Kabushiki Kaisha Recording and/or reproducing apparatus in which a reference signal is used in a recording and/or reproducing part as well as in another part
US5027235A (en) * 1988-07-28 1991-06-25 Sony Corporation Method for controlling a dynamic tracking head of a digital video tape recorder
US5047869A (en) * 1987-11-06 1991-09-10 Asahi Kogaku Kogyo K.K. Recording device for electronic still camera
US5050014A (en) * 1988-03-22 1991-09-17 Fuji Photo Film, Ltd. Magnetic recording apparatus for correcting the absolute track position
US5065259A (en) * 1988-04-07 1991-11-12 Sony Corporation Magnetic recording and/or reproducing apparatus
JPH0414973A (en) * 1990-05-09 1992-01-20 Toshiba Corp Rotary heat type picture recording and reproducing device
EP0469842A2 (en) * 1990-07-30 1992-02-05 Matsushita Electric Industrial Co., Ltd. Video signal digital recording/reproducing apparatus
US5097363A (en) * 1986-04-15 1992-03-17 Canon Kabushiki Kaisha Still image signal recording and reproducing apparatus having greater feeder speed when searching
US5119208A (en) * 1988-05-06 1992-06-02 Canon Kabushiki Kaisha Image signal recording apparatus
US5126852A (en) * 1990-04-27 1992-06-30 Matsushita Electric Industrial Co., Ltd. Compressed video signal recording/variable-speed reproduction apparatus
US5132807A (en) * 1988-07-28 1992-07-21 Canon Kabushiki Kaisha Recording apparatus for recording main information with additional information
US5134464A (en) * 1990-11-16 1992-07-28 North American Philips Corporation Method and apparatus for the transmission and reception of a multicarrier digital television signal
US5136394A (en) * 1989-06-19 1992-08-04 Sharp Kabushiki Kaisha Picture search system for digital recording/reproducing apparatus
US5140437A (en) * 1989-04-02 1992-08-18 Sony Corporation Recording/reproducing compressed data on a rotatable record medium in which at least one intraframe code signal and at least (n-1) interframe code signals are recorded in each track
US5140417A (en) * 1989-06-20 1992-08-18 Matsushita Electric Co., Ltd. Fast packet transmission system of video data
US5144425A (en) * 1991-08-26 1992-09-01 General Electric Company Apparatus for hierarchically dividing video signals
US5146337A (en) * 1990-08-06 1992-09-08 Thomson Consumer Electronics, Inc Using a first IF of 43.5 MHZ or less in an FM radio in a television tuner
US5148272A (en) * 1991-02-27 1992-09-15 Rca Thomson Licensing Corporation Apparatus for recombining prioritized video data
EP0509594A2 (en) * 1991-04-18 1992-10-21 Philips Electronics N.V. System and method for improving video recorder performance in a search mode
US5212549A (en) * 1991-04-29 1993-05-18 Rca Thomson Licensing Corporation Error concealment apparatus for a compressed video signal processing system
JPH05137114A (en) * 1991-11-14 1993-06-01 Mitsubishi Electric Corp Digital video tape recorder
US5218449A (en) * 1992-02-24 1993-06-08 Samsung Electronics Co., Ltd. Nervous clock signal generator for video recorder
US5225946A (en) * 1989-02-20 1993-07-06 Pioneer Electronic Corporation Information recording/reproducing apparatus for reproducing a portion of a picture signal during a fast feeding/rewinding operation
EP0562845A2 (en) * 1992-03-24 1993-09-29 Kabushiki Kaisha Toshiba Variable length code recording/playback apparatus for a video recorder
US5282049A (en) * 1991-02-08 1994-01-25 Olympus Optical Co., Ltd. Moving-picture data digital recording and reproducing apparatuses
US5291343A (en) * 1988-12-01 1994-03-01 Matsushita Electric Industrial Co., Ltd. Audio/video system for television receiver, video cassette recorder, and so forth
US5301032A (en) * 1992-04-07 1994-04-05 Samsung Electronics Co., Ltd. Digital image compression and decompression method and apparatus using variable-length coding
US5355229A (en) * 1988-06-07 1994-10-11 Mitsubishi Denki Kabushiki Kaisha Digital signal recording method and digital video tape recorder
US5416604A (en) * 1992-05-27 1995-05-16 Samsung Electronics Co., Ltd. Image compression method for bit-fixation and the apparatus therefor
US5477397A (en) * 1993-02-23 1995-12-19 Matsushita Electric Corporation Of America Digital high definition television receiver with features that facilitate trick-play modes on a digital VCR
US5497246A (en) * 1993-07-15 1996-03-05 Asahi Kogaku Kogyo Kabushiki Kaisha Image signal processing device
US5533138A (en) * 1992-03-13 1996-07-02 Samsung Electronics Co., Ltd. Image compression encoding and decoding method and apparatus therefor
US5559557A (en) * 1992-09-28 1996-09-24 Sony Corporation Motion video coding with adaptive precision for DC component coefficient quantization and variable length coding

Patent Citations (57)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3934268A (en) * 1967-08-02 1976-01-20 Sony Corporation System for magnetically recording and reproducing still video pictures and audio information
US4031548A (en) * 1974-09-30 1977-06-21 Sony Corporation Plural receiving and recording television system
US4139867A (en) * 1976-09-18 1979-02-13 Robert Bosch Gmbh Method for fast- and slow-motion reproduction of video signals stored in a succession of parallel tracks on a record medium
US4193098A (en) * 1977-03-24 1980-03-11 Spin Physics, Inc. Segmented video playback apparatus with ancillary recording medium
US4783707A (en) * 1978-04-13 1988-11-08 Canon Kabushiki Kaisha Automatic control means for a picture image recording device
US4290087A (en) * 1978-06-19 1981-09-15 Spin Physics, Inc. Coarse and fine control of segmented video playback apparatus with ancillary recording medium
US4263623A (en) * 1979-04-02 1981-04-21 Eastman Kodak Company Slow-frame video camera/recorder and image-sensing and signal processing device for use therewith
US4392162A (en) * 1979-10-04 1983-07-05 Sony Corporation Digital video signal reproducing apparatus
US4355324A (en) * 1980-03-03 1982-10-19 Rca Corporation Sampled or digitized color in a high speed search record and replay system
US4339775A (en) * 1980-06-16 1982-07-13 Eastman Technology, Inc. Fast frame rate augmentation
US4584613A (en) * 1980-08-20 1986-04-22 Sony Corporation Apparatus for recording video signals at a plurality of different recording speeds
US4558376A (en) * 1980-12-03 1985-12-10 Robert Bosch Gmbh Method and system of reproduction of magnetically recorded video signals at speeds differing from recording speed
US4541020A (en) * 1981-07-22 1985-09-10 Olympus Optical Co., Ltd. Data recording/reproducing apparatus
US4510538A (en) * 1981-12-14 1985-04-09 Sony Corporation Magnetic recording apparatus
US4504869A (en) * 1982-09-20 1985-03-12 Rca Corporation Color moviola for two-track VTR
US4636874A (en) * 1983-03-15 1987-01-13 U.S. Philips Corporation System for reproducing information signals on a magnetic tape which incrementally adjusts, in a plurality of steps the speed of the magnetic tape and the positioning and rotational speed of the magnetic head upon a change of mode
US4636879A (en) * 1983-07-06 1987-01-13 Ricoh Company, Ltd. VTR system
US4668998A (en) * 1984-01-31 1987-05-26 Sony Corporation Time base correction for VTR with variable tape speed
US4910605A (en) * 1986-02-18 1990-03-20 Matsushita Electric Industrial Co., Ltd. Video signal recording method and apparatus for field-segment recording
US4887169A (en) * 1986-04-04 1989-12-12 Matsushita Electric Industrial Co., Ltd. Video signal recording and playback apparatus having varied-speed playback capability
US4985781A (en) * 1986-04-15 1991-01-15 Canon Kabushiki Kaisha Recording and/or reproducing apparatus in which a reference signal is used in a recording and/or reproducing part as well as in another part
US5097363A (en) * 1986-04-15 1992-03-17 Canon Kabushiki Kaisha Still image signal recording and reproducing apparatus having greater feeder speed when searching
US4807053A (en) * 1986-06-05 1989-02-21 U.S. Philips Corporation Method and apparatus for recording and/or reproducing video information in/for a record carrier, and record carrier obtained by means of the method
US4825301A (en) * 1987-07-16 1989-04-25 Polaroid Corporation Apparatus for encoding and decoding high resolution still images and video images for recording on a standard storage media
US5047869A (en) * 1987-11-06 1991-09-10 Asahi Kogaku Kogyo K.K. Recording device for electronic still camera
US5050014A (en) * 1988-03-22 1991-09-17 Fuji Photo Film, Ltd. Magnetic recording apparatus for correcting the absolute track position
US5065259A (en) * 1988-04-07 1991-11-12 Sony Corporation Magnetic recording and/or reproducing apparatus
US5119208A (en) * 1988-05-06 1992-06-02 Canon Kabushiki Kaisha Image signal recording apparatus
US5355229A (en) * 1988-06-07 1994-10-11 Mitsubishi Denki Kabushiki Kaisha Digital signal recording method and digital video tape recorder
US5132807A (en) * 1988-07-28 1992-07-21 Canon Kabushiki Kaisha Recording apparatus for recording main information with additional information
US5027235A (en) * 1988-07-28 1991-06-25 Sony Corporation Method for controlling a dynamic tracking head of a digital video tape recorder
US5136391A (en) * 1988-11-02 1992-08-04 Sanyo Electric Co., Ltd. Digital video tape recorder capable of accurate image reproduction during high speed tape motion
EP0367264A2 (en) * 1988-11-02 1990-05-09 Sanyo Electric Co., Ltd. A digital video tape recorder capable of high speed image reproduction
US5291343A (en) * 1988-12-01 1994-03-01 Matsushita Electric Industrial Co., Ltd. Audio/video system for television receiver, video cassette recorder, and so forth
US5225946A (en) * 1989-02-20 1993-07-06 Pioneer Electronic Corporation Information recording/reproducing apparatus for reproducing a portion of a picture signal during a fast feeding/rewinding operation
US5140437A (en) * 1989-04-02 1992-08-18 Sony Corporation Recording/reproducing compressed data on a rotatable record medium in which at least one intraframe code signal and at least (n-1) interframe code signals are recorded in each track
US5136394A (en) * 1989-06-19 1992-08-04 Sharp Kabushiki Kaisha Picture search system for digital recording/reproducing apparatus
US5140417A (en) * 1989-06-20 1992-08-18 Matsushita Electric Co., Ltd. Fast packet transmission system of video data
US5126852A (en) * 1990-04-27 1992-06-30 Matsushita Electric Industrial Co., Ltd. Compressed video signal recording/variable-speed reproduction apparatus
JPH0414973A (en) * 1990-05-09 1992-01-20 Toshiba Corp Rotary heat type picture recording and reproducing device
EP0469842A2 (en) * 1990-07-30 1992-02-05 Matsushita Electric Industrial Co., Ltd. Video signal digital recording/reproducing apparatus
US5146337A (en) * 1990-08-06 1992-09-08 Thomson Consumer Electronics, Inc Using a first IF of 43.5 MHZ or less in an FM radio in a television tuner
US5134464A (en) * 1990-11-16 1992-07-28 North American Philips Corporation Method and apparatus for the transmission and reception of a multicarrier digital television signal
US5282049A (en) * 1991-02-08 1994-01-25 Olympus Optical Co., Ltd. Moving-picture data digital recording and reproducing apparatuses
US5148272A (en) * 1991-02-27 1992-09-15 Rca Thomson Licensing Corporation Apparatus for recombining prioritized video data
EP0509594A2 (en) * 1991-04-18 1992-10-21 Philips Electronics N.V. System and method for improving video recorder performance in a search mode
US5212549A (en) * 1991-04-29 1993-05-18 Rca Thomson Licensing Corporation Error concealment apparatus for a compressed video signal processing system
US5144425A (en) * 1991-08-26 1992-09-01 General Electric Company Apparatus for hierarchically dividing video signals
JPH05137114A (en) * 1991-11-14 1993-06-01 Mitsubishi Electric Corp Digital video tape recorder
US5218449A (en) * 1992-02-24 1993-06-08 Samsung Electronics Co., Ltd. Nervous clock signal generator for video recorder
US5533138A (en) * 1992-03-13 1996-07-02 Samsung Electronics Co., Ltd. Image compression encoding and decoding method and apparatus therefor
EP0562845A2 (en) * 1992-03-24 1993-09-29 Kabushiki Kaisha Toshiba Variable length code recording/playback apparatus for a video recorder
US5301032A (en) * 1992-04-07 1994-04-05 Samsung Electronics Co., Ltd. Digital image compression and decompression method and apparatus using variable-length coding
US5416604A (en) * 1992-05-27 1995-05-16 Samsung Electronics Co., Ltd. Image compression method for bit-fixation and the apparatus therefor
US5559557A (en) * 1992-09-28 1996-09-24 Sony Corporation Motion video coding with adaptive precision for DC component coefficient quantization and variable length coding
US5477397A (en) * 1993-02-23 1995-12-19 Matsushita Electric Corporation Of America Digital high definition television receiver with features that facilitate trick-play modes on a digital VCR
US5497246A (en) * 1993-07-15 1996-03-05 Asahi Kogaku Kogyo Kabushiki Kaisha Image signal processing device

Non-Patent Citations (40)

* Cited by examiner, † Cited by third party
Title
"A Study On New DCT-Based Bit Rate reduction Algorithm And VariableSpeed Playback For A Home-Use Digital VCR", IEEE Trans. on Consumer Electronics, vol. 38, No. 3, Aug. 1992, pp. 236-242.
"A Study On Trick Plays For Digital VCR", Yamamitsu et al, IEEE Trans. on Consumer Electronics, vol. 37, No. 3, Aug. 1991, pp. 261-266, 1991.
"An Experimental Digital VCR With New DCT-Based Bit-Rate Reduction System", Yoneda et al, IEEE Trans. on Consumer Electronics, vol. 37, No. 3, Aug. 1991, pp. 275-282, 1991.
"Bit Rate Reduction Algorithm For A Digital VCR", Kim et al, IEEE Trans. on Consumer Electronics, vol. 37, No. 3, Aug. 1991, pp. 267-274, 1991.
"New ADRC for Consumer Digital VCR", Kondo et al, IEEE, pp. 144-150, 1992.
"Record and Playback Systems for 1.2 Gb/s HDTV Digital VCR", Umemoto et al, IEEE, pp. 54-59, 1992.
A Study On New DCT Based Bit Rate reduction Algorithm And VariableSpeed Playback For A Home Use Digital VCR , IEEE Trans. on Consumer Electronics, vol. 38, No. 3, Aug. 1992, pp. 236 242. *
A Study On Trick Plays For Digital VCR , Yamamitsu et al, IEEE Trans. on Consumer Electronics, vol. 37, No. 3, Aug. 1991, pp. 261 266, 1991. *
Advanced Television Research Consortium, "Advanced Digital Television, Prototype Hardware Description", Feb. 12, 1992.
Advanced Television Research Consortium, Advanced Digital Television, Prototype Hardware Description , Feb. 12, 1992. *
An Experimental Digital VCR With New DCT Based Bit Rate Reduction System , Yoneda et al, IEEE Trans. on Consumer Electronics, vol. 37, No. 3, Aug. 1991, pp. 275 282, 1991. *
Bit Rate Reduction Algorithm For A Digital VCR , Kim et al, IEEE Trans. on Consumer Electronics, vol. 37, No. 3, Aug. 1991, pp. 267 274, 1991. *
C. Yamamitsu, A. Ide, M. Nishino, T. Juri, H. Ohtaka, IEEE Transactions on Consumer Electronics, "A Study on Trick Plays for Digital VCR", vol. 37, No. 3, Aug. 1991, pp. 261-266.
C. Yamamitsu, A. Ide, M. Nishino, T. Juri, H. Ohtaka, IEEE Transactions on Consumer Electronics, A Study on Trick Plays for Digital VCR , vol. 37, No. 3, Aug. 1991, pp. 261 266. *
David Sarnoff Research Center, Philips Laboratories, "Advanced Digital Television, System Description", Jan. 20, 1992.
David Sarnoff Research Center, Philips Laboratories, Advanced Digital Television, System Description , Jan. 20, 1992. *
Drafts of Recommendation H.262,ISO/TEC 13818 2 titled Information Technology Generic Coding of Moving Pictures and Associated Audio , (Nov. 1993 ISO MPEG Committee draft). *
Drafts of Recommendation H.262,ISO/TEC 13818 titled Information Technology Generic Coding of Moving Pictures and Associated Audio , (Nov. 1993 ISO MPEG Committee draft). *
Drafts of Recommendation H.262,ISO/TEC 13818-2 titled "Information Technology--Generic Coding of Moving Pictures and Associated Audio", (Nov. 1993 ISO-MPEG Committee draft).
Drafts of Recommendation H.262,ISO/TEC 13818-titled "Information Technology--Generic Coding of Moving Pictures and Associated Audio", (Nov. 1993 ISO-MPEG Committee draft).
General Instruments Corporation Videocipher Division, "Digicipher HDTV System Description", Document No. 62004, Aug. 22, 1991.
General Instruments Corporation Videocipher Division, Digicipher HDTV System Description , Document No. 62004, Aug. 22, 1991. *
Ho, Yo Sung, et al. MPEG Based Video Coding for Digital Simulcasting, International Workshop on HDTV 92, Nov. 18 20, 1992, Proceedings vol. 1, pp. 141 148. *
Ho, Yo-Sung, et al. "MPEG-Based Video Coding for Digital Simulcasting," International Workshop on HDTV '92, Nov. 18-20, 1992, Proceedings vol. 1, pp. 141-148.
I.S.O. MPEG (Moving Pictures Expert Group), "Coding of Moving Pictures and Associated Audio for Digital Storage Media at up to about 1.5Mbit/s, Part 2 Video", 2-11172 rev 1, Nov. 23, 1991.
I.S.O. MPEG (Moving Pictures Expert Group), Coding of Moving Pictures and Associated Audio for Digital Storage Media at up to about 1.5Mbit/s, Part 2 Video , 2 11172 rev 1, Nov. 23, 1991. *
J. Lee, J. Seo, Y. Park, D. Youn, T. Oh, IEEE Transactions on Consumer Electronics, "A Study on New DCT-Based Bit Rate Reduction Algorithm and Variable Speed Playback for a Home-Use Digital VCR", vol. 38, No. 3, Aug. 1992, pp. 236-241.
J. Lee, J. Seo, Y. Park, D. Youn, T. Oh, IEEE Transactions on Consumer Electronics, A Study on New DCT Based Bit Rate Reduction Algorithm and Variable Speed Playback for a Home Use Digital VCR , vol. 38, No. 3, Aug. 1992, pp. 236 241. *
New ADRC for Consumer Digital VCR , Kondo et al, IEEE, pp. 144 150, 1992. *
Record and Playback Systems for 1.2 Gb/s HDTV Digital VCR , Umemoto et al, IEEE, pp. 54 59, 1992. *
Richard Brush, "Design considerations for the D-2 NTSC composite DNTR", pp. 182-193,SMPTE Journal, Mar. 1988.
Richard Brush, Design considerations for the D 2 NTSC composite DNTR , pp. 182 193,SMPTE Journal, Mar. 1988. *
Robert Rast, Joseph Glaab, General Instrument Corporation, "Interoperability Considerations for Digi Cipher HDTV", Oct. 1, 1992.
Robert Rast, Joseph Glaab, General Instrument Corporation, Interoperability Considerations for Digi Cipher HDTV , Oct. 1, 1992. *
S. Inoue, H. Kaneko, H. Takao, T. Fujii, M. Ishibashi, IEEE Transactions on Consumer Electronics, "New Method for Variable Speed Playback for High Definition VCRs", vol. 37, No. 3, Aug. 1991, pp. 244-251.
S. Inoue, H. Kaneko, H. Takao, T. Fujii, M. Ishibashi, IEEE Transactions on Consumer Electronics, New Method for Variable Speed Playback for High Definition VCRs , vol. 37, No. 3, Aug. 1991, pp. 244 251. *
Sun, H., et al. "Error Concealment in Digital Simulcast AD-HDTV Decoder," IEEE Transactions on Consumer Electronics, vol. 38, No. 3, Aug. 1992, pp. 108-118.
Sun, H., et al. Error Concealment in Digital Simulcast AD HDTV Decoder, IEEE Transactions on Consumer Electronics, vol. 38, No. 3, Aug. 1992, pp. 108 118. *
Zenith, AT&T, "Technical Details, Digital Spectrum Comparable", Sep. 23, 1991.
Zenith, AT&T, Technical Details, Digital Spectrum Comparable , Sep. 23, 1991. *

Cited By (132)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6175592B1 (en) * 1997-03-12 2001-01-16 Matsushita Electric Industrial Co., Ltd. Frequency domain filtering for down conversion of a DCT encoded picture
US6463101B1 (en) * 1998-03-19 2002-10-08 Kabushiki Kaisha Toshiba Video encoding method and apparatus
WO1999065239A2 (en) * 1998-06-11 1999-12-16 Koninklijke Philips Electronics N.V. Trick play signal generation for a digital video recorder
WO1999065239A3 (en) * 1998-06-11 2000-03-09 Koninkl Philips Electronics Nv Trick play signal generation for a digital video recorder
US6304295B1 (en) * 1998-09-18 2001-10-16 Sarnoff Corporation Region-based refresh strategy for video compression
US6574277B1 (en) * 1998-11-25 2003-06-03 Nec Corporation Moving-picture coding apparatus and method
EP1028593A3 (en) * 1999-02-11 2005-01-26 PacketVideo Corporation Method and device for control and delivery of digitally compressed visual data in a heterogeneous communication network
EP1028593A2 (en) * 1999-02-11 2000-08-16 PacketVideo Corporation Method and device for control and delivery of digitally compressed visual data in a heterogeneous communication network
US20040044008A1 (en) * 2000-06-01 2004-03-04 Daugan Alain Claude-Marie Use of therapeutic benzamide derivatives
US20040129721A1 (en) * 2001-03-06 2004-07-08 Alessandro Bianchini Apparatus and method for working plastic material and container for fluid product
US7068716B1 (en) * 2001-03-15 2006-06-27 Bigband Networks, Inc. Method and system for compressing groups of basic media data units
US20060262926A1 (en) * 2001-06-06 2006-11-23 Candelore Brant L Time division partial encryption
US7751560B2 (en) 2001-06-06 2010-07-06 Sony Corporation Time division partial encryption
US20060115083A1 (en) * 2001-06-06 2006-06-01 Candelore Brant L Partial encryption and PID mapping
US7895616B2 (en) 2001-06-06 2011-02-22 Sony Corporation Reconstitution of program streams split across multiple packet identifiers
US7319753B2 (en) 2001-06-06 2008-01-15 Sony Corporation Partial encryption and PID mapping
US20020194613A1 (en) * 2001-06-06 2002-12-19 Unger Robert Allan Reconstitution of program streams split across multiple program identifiers
US7310422B2 (en) 2001-06-06 2007-12-18 Sony Corporation Partial encryption and PID mapping
US20070271470A9 (en) * 2001-06-06 2007-11-22 Candelore Brant L Upgrading of encryption
US7287168B2 (en) 2001-06-06 2007-10-23 Sony Corporation Partial encryption and PID mapping
US20040049688A1 (en) * 2001-06-06 2004-03-11 Candelore Brant L. Upgrading of encryption
US7336787B2 (en) 2001-06-06 2008-02-26 Sony Corporation Critical packet partial encryption
US7376341B2 (en) 2001-07-12 2008-05-20 Thomson Licensing Modifying video signals by converting non-intra pictures
EP1428385A4 (en) * 2001-07-12 2005-12-14 Thomson Licensing Modifying video signals by converting non-intra pictures
KR100912171B1 (en) * 2001-07-12 2009-08-14 톰슨 라이센싱 Modifying video signals by converting non-intra pictures
US20030012561A1 (en) * 2001-07-12 2003-01-16 Willis Donald Henry Modifying video signals by converting non-intra pictures
EP1428385A1 (en) * 2001-07-12 2004-06-16 Thomson Licensing S.A. Modifying video signals by converting non-intra pictures
EP1438851A4 (en) * 2001-10-05 2010-05-05 Thomson Licensing Slow forward trick mode playback of recorded video
EP1438851A1 (en) * 2001-10-05 2004-07-21 Thomson Licensing S.A. Slow forward trick mode playback of recorded video
US20030161540A1 (en) * 2001-10-30 2003-08-28 Bops, Inc. Methods and apparatus for video decoding
EP1466475A1 (en) * 2001-12-19 2004-10-13 Thomson Licensing Trick mode playback of recorded video
WO2003055209A1 (en) 2001-12-19 2003-07-03 Thomson Licensing S.A. Trick mode playback of recorded video
EP1466475A4 (en) * 2001-12-19 2010-05-12 Thomson Licensing Trick mode playback of recorded video
US7233669B2 (en) 2002-01-02 2007-06-19 Sony Corporation Selective encryption to enable multiple decryption keys
US20030159140A1 (en) * 2002-01-02 2003-08-21 Candelore Brant L. Selective encryption to enable multiple decryption keys
US20030159139A1 (en) * 2002-01-02 2003-08-21 Candelore Brant L. Video slice and active region based dual partial encryption
US7302059B2 (en) 2002-01-02 2007-11-27 Sony Corporation Star pattern partial encryption
US20050028193A1 (en) * 2002-01-02 2005-02-03 Candelore Brant L. Macro-block based content replacement by PID mapping
US20030174837A1 (en) * 2002-01-02 2003-09-18 Candelore Brant L. Content replacement by PID mapping
US7292691B2 (en) 2002-01-02 2007-11-06 Sony Corporation Progressive video refresh slice detection
US20030152224A1 (en) * 2002-01-02 2003-08-14 Candelore Brant L. Video scene change detection
US7155012B2 (en) 2002-01-02 2006-12-26 Sony Corporation Slice mask and moat pattern partial encryption
US20030133570A1 (en) * 2002-01-02 2003-07-17 Candelore Brant L. Star pattern partial encryption
US20030156718A1 (en) * 2002-01-02 2003-08-21 Candelore Brant L. Progressive video refresh slice detection
US7218738B2 (en) 2002-01-02 2007-05-15 Sony Corporation Encryption and content control in a digital broadcast system
US7215770B2 (en) 2002-01-02 2007-05-08 Sony Corporation System and method for partially encrypted multimedia stream
US20030152226A1 (en) * 2002-01-02 2003-08-14 Candelore Brant L. Slice mask and moat pattern partial encryption
US7823174B2 (en) 2002-01-02 2010-10-26 Sony Corporation Macro-block based content replacement by PID mapping
US20030123664A1 (en) * 2002-01-02 2003-07-03 Pedlow Leo M. Encryption and content control in a digital broadcast system
US7765567B2 (en) 2002-01-02 2010-07-27 Sony Corporation Content replacement by PID mapping
US7292690B2 (en) 2002-01-02 2007-11-06 Sony Corporation Video scene change detection
WO2003094527A3 (en) * 2002-05-06 2004-02-05 Koninkl Philips Electronics Nv Mpeg transcoding system and method using motion information
US20030206590A1 (en) * 2002-05-06 2003-11-06 Koninklijke Philips Electronics N.V. MPEG transcoding system and method using motion information
WO2003094527A2 (en) * 2002-05-06 2003-11-13 Koninklijke Philips Electronics N.V. Mpeg transcoding system and method using motion information
US20090180025A1 (en) * 2002-05-28 2009-07-16 Sony Corporation Method and apparatus for overlaying graphics on video
US20030222994A1 (en) * 2002-05-28 2003-12-04 Sony Electronics Inc. Method and apparatus for synchronizing dynamic graphics
US7530084B2 (en) 2002-05-28 2009-05-05 Sony Corporation Method and apparatus for synchronizing dynamic graphics
US20110182360A1 (en) * 2002-07-14 2011-07-28 Thomas Pun Encoding video
US20110188575A1 (en) * 2002-07-14 2011-08-04 Thomas Pun Encoding video
US8111751B2 (en) * 2002-07-14 2012-02-07 Apple Inc. Encoding video
US8325808B2 (en) 2002-07-14 2012-12-04 Apple Inc. Encoding video
US9819939B2 (en) 2002-07-15 2017-11-14 Apple Inc. Method for implementing a quantizer in a multimedia compression and encoding system
US8428127B2 (en) 2002-07-15 2013-04-23 Apple Inc. Method of performing rate control for a compression system
US7769084B1 (en) * 2002-07-15 2010-08-03 Apple Inc. Method for implementing a quantizer in a multimedia compression and encoding system
US20090010325A1 (en) * 2002-07-15 2009-01-08 Xiaochun Nie Method of performing rate control for a compression system
US20080232469A1 (en) * 2002-07-15 2008-09-25 Xiaochun Nie Rate Control for a Multimedia Compression and Encoding System
US10104375B2 (en) 2002-07-15 2018-10-16 Apple Inc. Method for implementing a quantizer in a multimedia compression and encoding system
US9137535B2 (en) 2002-07-15 2015-09-15 Apple Inc. Method for implementing a quantizer in a multimedia compression and encoding system
US7418037B1 (en) 2002-07-15 2008-08-26 Apple Inc. Method of performing rate control for a compression system
US8300690B2 (en) 2002-07-16 2012-10-30 Nokia Corporation Method for random access and gradual picture refresh in video coding
CN101232616B (en) * 2002-07-16 2015-07-22 诺基亚有限公司 Method for random access and gradual picture refresh in video coding
JP2008099325A (en) * 2002-07-16 2008-04-24 Nokia Corp Method for random access and gradual video refresh in video coding
JP4695129B2 (en) * 2002-07-16 2011-06-08 ノキア コーポレイション The method for random access and gradual image update in the image coding
WO2004008735A3 (en) * 2002-07-16 2004-03-18 Nokia Corp A method for random access and gradual picture refresh in video coding
WO2004008735A2 (en) * 2002-07-16 2004-01-22 Nokia Corporation A method for random access and gradual picture refresh in video coding
US20040066854A1 (en) * 2002-07-16 2004-04-08 Hannuksela Miska M. Method for random access and gradual picture refresh in video coding
US8818896B2 (en) 2002-09-09 2014-08-26 Sony Corporation Selective encryption with coverage encryption
US20040049691A1 (en) * 2002-09-09 2004-03-11 Candelore Brant L. Selective encryption to enable trick play
US20050192904A1 (en) * 2002-09-09 2005-09-01 Candelore Brant L. Selective encryption with coverage encryption
US20040047470A1 (en) * 2002-09-09 2004-03-11 Candelore Brant L. Multiple partial encryption using retuning
US7151833B2 (en) 2002-09-09 2006-12-19 Sony Corporation Selective encryption to enable trick play
US7242773B2 (en) 2002-09-09 2007-07-10 Sony Corporation Multiple partial encryption using retuning
US8477843B2 (en) 2002-12-16 2013-07-02 Apple Inc. Method of implementing improved rate control for a multimedia compression and encoding system
US7804897B1 (en) 2002-12-16 2010-09-28 Apple Inc. Method for implementing an improved quantizer in a multimedia compression and encoding system
US7940843B1 (en) 2002-12-16 2011-05-10 Apple Inc. Method of implementing improved rate control for a multimedia compression and encoding system
US20040187161A1 (en) * 2003-03-20 2004-09-23 Cao Adrean T. Auxiliary program association table
US20040240668A1 (en) * 2003-03-25 2004-12-02 James Bonan Content scrambling with minimal impact on legacy devices
US20050036067A1 (en) * 2003-08-05 2005-02-17 Ryal Kim Annon Variable perspective view of video images
US7286667B1 (en) 2003-09-15 2007-10-23 Sony Corporation Decryption system
US20050066357A1 (en) * 2003-09-22 2005-03-24 Ryal Kim Annon Modifying content rating
US7263187B2 (en) 2003-10-31 2007-08-28 Sony Corporation Batch mode session-based encryption of video on demand content
US7853980B2 (en) 2003-10-31 2010-12-14 Sony Corporation Bi-directional indices for trick mode video-on-demand
US20050094808A1 (en) * 2003-10-31 2005-05-05 Pedlow Leo M.Jr. Dynamic composition of pre-encrypted video on demand content
US20050097596A1 (en) * 2003-10-31 2005-05-05 Pedlow Leo M.Jr. Re-encrypted delivery of video-on-demand content
US20050097597A1 (en) * 2003-10-31 2005-05-05 Pedlow Leo M.Jr. Hybrid storage of video on demand content
US20050094809A1 (en) * 2003-11-03 2005-05-05 Pedlow Leo M.Jr. Preparation of content for multiple conditional access methods in video on demand
US20050102702A1 (en) * 2003-11-12 2005-05-12 Candelore Brant L. Cablecard with content manipulation
US20050129233A1 (en) * 2003-12-16 2005-06-16 Pedlow Leo M.Jr. Composite session-based encryption of Video On Demand content
US20050169473A1 (en) * 2004-02-03 2005-08-04 Candelore Brant L. Multiple selective encryption with DRM
US20070189710A1 (en) * 2004-12-15 2007-08-16 Pedlow Leo M Jr Content substitution editor
US8041190B2 (en) 2004-12-15 2011-10-18 Sony Corporation System and method for the creation, synchronization and delivery of alternate content
US20100322596A9 (en) * 2004-12-15 2010-12-23 Pedlow Leo M Content substitution editor
US7895617B2 (en) 2004-12-15 2011-02-22 Sony Corporation Content substitution editor
US7366239B1 (en) 2005-01-26 2008-04-29 Big Band Networks Inc. Method and system for compressing groups of basic media data units
GB2429593A (en) * 2005-08-26 2007-02-28 Electrosonic Ltd Data compressing using a wavelet compression scheme
US20100014590A1 (en) * 2005-08-26 2010-01-21 Electrosonic Limited Image data processing
US10051288B2 (en) 2005-08-26 2018-08-14 Rgb Systems, Inc. Method and apparatus for compressing image data using a tree structure
US9204170B2 (en) 2005-08-26 2015-12-01 Rgb Systems, Inc. Method for image data processing utilizing multiple transform engines
US9930364B2 (en) 2005-08-26 2018-03-27 Rgb Systems, Inc. Method and apparatus for encoding image data using wavelet signatures
US10244263B2 (en) 2005-08-26 2019-03-26 Rgb Systems, Inc. Method and apparatus for packaging image data for transmission over a network
US9924199B2 (en) 2005-08-26 2018-03-20 Rgb Systems, Inc. Method and apparatus for compressing image data using compression profiles
US8185921B2 (en) 2006-02-28 2012-05-22 Sony Corporation Parental control of displayed content using closed captioning
US20070208668A1 (en) * 2006-03-01 2007-09-06 Candelore Brant L Multiple DRM management
US20080260266A1 (en) * 2006-10-23 2008-10-23 Fujitsu Limited Encoding apparatus, encoding method, and computer product
US7974479B2 (en) * 2006-10-23 2011-07-05 Fujitsu Limited Encoding apparatus, method, and computer product, for controlling intra-refresh
US8249141B1 (en) 2007-07-13 2012-08-21 Sprint Spectrum L.P. Method and system for managing bandwidth based on intraframes
WO2010076749A1 (en) * 2008-12-31 2010-07-08 Nxp B.V. System and method for providing fast trick modes
US20100166079A1 (en) * 2008-12-31 2010-07-01 Nxp B.V. System and method for providing fast trick modes
US8428145B2 (en) 2008-12-31 2013-04-23 Entropic Communications, Inc. System and method for providing fast trick modes
CN101505425B (en) 2009-03-11 2011-11-23 北京中星微电子有限公司 Macro block filtering method and apparatus
US20110051802A1 (en) * 2009-08-27 2011-03-03 Nxp B.V. System and method for video compression using non-linear quantization and modular arithmetic computation
US8379715B2 (en) * 2009-08-27 2013-02-19 Nxp B. V. System and method for video compression using non-linear quantization and modular arithmetic computation
US20160261920A1 (en) * 2009-11-30 2016-09-08 Time Warner Cable Enterprises Llc Methods and apparatus for supporting vod requests in a system with hierarchical content stores
US8699571B2 (en) 2010-10-21 2014-04-15 Motorola Solutions, Inc. Method and apparatus for non-linear decoding of video frames of a video stream encoded using an intra macroblock refresh process
WO2012054187A3 (en) * 2010-10-21 2012-06-14 Motorola Solutions, Inc. Method and apparatus for non-linear decoding of video frames of a video stream encoded using an intra macroblock refresh process
US9635387B2 (en) 2011-08-29 2017-04-25 Beamr Imaging Ltd. Controlling a video content system
US10225550B2 (en) 2011-08-29 2019-03-05 Beamr Imaging Ltd Controlling a video content system by computing a frame quality score
US9491464B2 (en) 2011-08-29 2016-11-08 Beamr Imaging Ltd Controlling a video content system by computing a frame quality score
EP2807821A4 (en) * 2012-01-23 2016-06-15 Beamr Imaging Ltd Method and system for controlling video frame encoding
CN104429069B (en) * 2012-04-13 2018-09-18 威勒斯媒体国际有限公司 Apparatus for identifying a preamble screen
CN104429069A (en) * 2012-04-13 2015-03-18 夏普株式会社 Devices for identifying a leading picture
US9992252B2 (en) 2015-09-29 2018-06-05 Rgb Systems, Inc. Method and apparatus for adaptively compressing streaming video

Similar Documents

Publication Publication Date Title
USRE41435E1 (en) Adaptive variable-length coding and decoding methods for image data
RU2115258C1 (en) Video signal packing device (variants), device for reception of packed video signal and video signal processing device
CA2432170C (en) Method and apparatus for storing a stream of video data on a storage medium
US5802213A (en) Encoding video signals using local quantization levels
US5557330A (en) Encoding video signals using selective pre-filtering
US6556627B2 (en) Information processing apparatus, information processing method and recording medium
US6445738B1 (en) System and method for creating trick play video streams from a compressed normal play video bitstream
KR100384822B1 (en) Hdtv trick play stream derivation for vcr
CN1057891C (en) Method and device for recording quantitative and coded digital video signals
US5633682A (en) Stereoscopic coding system
EP0932980B1 (en) Video transmission apparatus employing intra-frame-only video compression that is mpeg-2 compatible
JP3141896B2 (en) Recording apparatus in a digital video signal
JP3215952B2 (en) Encoding apparatus and decoding apparatus
US6862402B2 (en) Digital recording and playback apparatus having MPEG CODEC and method therefor
EP0558016B1 (en) Method and apparatus for encoding an image signal using a multi-stage quantizing number determiner
KR100376607B1 (en) Mpeg video decoder with integrated scaling and display functions
EP0540350B1 (en) Method and apparatus for variable length coding
US5887115A (en) Method and apparatus for implementing a video tape recorder for recording digital video signals having either a fixed or variable data transmission rate
US6088047A (en) Motion compensated digital video decoding with buffered picture storage memory map
KR100251618B1 (en) Data transmission apparatus for transmitting code data
EP0576290B1 (en) Picture signal coding and decoding
JP3177383B2 (en) High definition television receiver including the function of facilitating trick-play mode of the digital vcr
EP0778709B1 (en) MPEG-2 decoding with a reduced RAM requisite by ADPCM recompression before storing MPEG decompressed data
EP1135934B1 (en) Efficient macroblock header coding for video compression
US5862295A (en) Variable length code recording/playback apparatus

Legal Events

Date Code Title Description
FPAY Fee payment

Year of fee payment: 4

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Expired due to failure to pay maintenance fee

Effective date: 20060310